Trypanosomes the largest subgroup are parasitic live

Trypanosomes= the largest subgroup, are parasiticLive in plants and animalsLong, tapered cells with an undulating membraneWavelike motion—single flagellumBiting insects act as vectors for many of these that parasitize humans•Euglenoids= flagellated protists closely related to kinetoplastidsoMost live in fresh water and none are human pathogensoTiny predators, few are parasites of larger organisms, and about a third have chloroplastsoStructure of euglenoid chloroplasts and the pigments inside them indicate that they evolved from a green alga by secondary endosymbiosisoPhotosynthetic euglenoids: detect light with an eyespot near base of long flagellumrevert to heterotrophic nutrition if light levels decline or conditions for photosynthesis become otherwise unfavorableohypertonic relative to fresh wateroContractile vacuoles= counter the tendency of water to diffuse into the cellExcess water collects in contractile vacuoles, which contract and expel it to the outside21.4 Foraminifera and Radiolarians•Related lineages of primarily heterotrophic single celled protists that secrete a sieve-like shelloFeed by capturing bits of organic debris and tiny organisms on threadlike or branching cytoplasmic extensions that stick out through the shell’s openingsoFew are members of marine planktonoPlankton= collection of mostly microscopic organisms that drift or swim in open waters•Chalky- Shelled Foraminifera

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